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采用聚苯乙烯-b-聚甲基丙烯酸甲酯嵌段共聚物(PS-b-PMMA)的甲苯稀溶液滴膜法制备PMMA伸展链,用原子力显微镜观察了PMMA分子链形貌及其在丙酮、水蒸气退火后的构象转变.结果表明,浓度(聚合物质量/溶液质量)为1×10~(-6)的PS-b-PMMA甲苯溶液可以在云母基底表面制备出高度为0.2 nm、长度为100~300 nm的PMMA伸展链;该方法可以适用于不同分子量的PS-b-PMMA共聚物,当PMMA嵌段分子链大于PS时,更容易制备高度伸展的PMMA分子链.丙酮蒸气退火可使胶束中的PMMA伸展链迅速收缩并与PS核融为一体变成球形结构.水蒸气退火作用下PMMA分子链的构象转变与制备胶束的起始浓度有关,浓度为1×10~(-6)的胶束只形成球状结构;浓度为5×10~(-6)的胶束含有较多的PMMA伸展链,在水蒸气退火后可形成花状胶束并可以组装成周围带有台阶状PMMA分子层的棒状胶束.
PMMA stretching chain was prepared by dilute toluene solution of polystyrene-b-polymethylmethacrylate block copolymer (PS-b-PMMA). The molecular chain morphology of PMMA and the morphology of PMMA chains were observed by atomic force microscopy. , And the conformational transformation after steam annealing.The results show that PS-b-PMMA toluene solution with concentration (polymer mass / solution mass) of 1 × 10 -6 can be prepared on mica substrate with a height of 0.2 nm, Length PMMA chain extending from 100 to 300 nm.The method can be applied to PS-b-PMMA copolymers with different molecular weights, and PMMA molecular chains are easier to prepare when the molecular chain of PMMA block is larger than PS. Acetone vapor annealing The PMMA chains in the micelles rapidly shrink and fuse with the PS nucleus to form a spherical structure.The conformational transition of the molecular chain of PMMA under water vapor annealing is related to the initial concentration of micelles and the concentration is 1 × 10 ~ (-6) micelles formed only spherical structures. The micelles with concentration of 5 × 10 ~ (-6) contained more PMMA chains and could form flower-like micelles after steam annealing and could be assembled into the surrounding bands There are stairs like PMMA molecular layer of rod micelles.